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EC-266 < COMPONENT DIAGNOSIS > [VQ35HR] P0420, P0430 THREE WAY CATALYST FUNCTION Diagnosis Procedure INFOID:0000000000956652 1. CHECK EXHAUST SYSTEM Visually check exhaust tubes and muffler for dent. Is the inspection result normal? YES >> GO TO 2. NO >> Repair or replace. 2. CHECK EXHAUST GAS LEAK 1. Start engine and run it at idle. 2. Listen for an exhaust gas leak before the three way catalyst 1. Is exhaust gas leak detected? YES >> Repair or replace. NO >> GO TO 3. 3. CHECK INTAKE AIR LEAK Listen for an intake air leak after the mass air flow sensor. YES >> Repair or replace. NO >> GO TO 4. 4. CHECK IGNITION TIMING Check the following items. Refer to EC-12, "BASIC INSPECTION : Special Repair Requirement" . Is the inspection result normal? YES >> GO TO 5. NO >> Follow the EC-12, "BASIC INSPECTION : Special Repair Requirement" 5. CHECK FUEL INJECTORS 1. Stop engine and then turn ignition switch ON. 2. Check the voltage between ECM harness connector and ground. PBIB1922E Items Specifications Target idle speed A/T: 650 ± 50 rpm (in P or N position) M/T: 650 ± 50 rpm (in Neutral position) Ignition timing A/T with 4WAS: 11 ± 5 ° BTDC (in P or N position) A/T without 4WAS: 15 ± 5 ° BTDC (in P or N position) M/T with 4WAS: 11 ± 5 ° BTDC (in Neutral position) M/T without 4WAS: 15 ± 5 ° BTDC (in Neutral position) |